scriptfunction getRemainingTime 发送 AJAX 请求 let xhr = new XMLHttpRequest; xhronreadystatechange = function if xhrreadyState === 4 && xhrstatus === 200 处理服务器返回的数据 let remainingTime

<script>
function getRemainingTime() {
  // 发送 AJAX 请求
  let xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function() {
    if (xhr.readyState === 4 && xhr.status === 200) {
      // 处理服务器返回的数据
      let remainingTime = xhr.responseText;
      
      // 将剩余时间转换为天、小时、分钟、秒数
      let days = Math.floor(remainingTime / (24 * 60 * 60));
      let hours = Math.floor((remainingTime % (24 * 60 * 60)) / (60 * 60));
      let minutes = Math.floor((remainingTime % (60 * 60)) / 60);
      let seconds = remainingTime % 60;
      
      // 将剩余时间输出到页面
      document.getElementById("remaining-days").innerHTML = days;
      document.getElementById("remaining-hours").innerHTML = hours;
      document.getElementById("remaining-minutes").innerHTML = minutes;
      document.getElementById("remaining-seconds").innerHTML = seconds;
    }
  };
  xhr.open("GET", "time.php");
  xhr.send();
}
</script>
<p>剩余时间：</p>
<p><span id="remaining-days"></span>天<span id="remaining-hours"></span>小时<span id="remaining-minutes"></span>分钟<span id="remaining-seconds"></span>秒</p>